Pulley



pril 30, 1940.

K. F. NYSTROM PULLEY Filed March 6, 1939 5 Sheets-Sheet 1 April 30, 1940. K. F. NYSTROM PULLEY Filed March 6, 1 939 5 Sheets-Sheet 5 ImJenTr A ril 30, 1940. K. F. NYsTRoM PULLEY Filed March 6, 1939 5 Sheets-Sheet 4 dl uorne April 30, 1940.

K. F. NYSTROM V 2,198,787

PULLEY Filed March 6, 1939 5 Sheets-Sheet 5 Patented Aprt30, 1940 PULLEY Karl F. Nystrom, Milwaukee, Wis, Application March 6, 1939,-seria1 No. 260,052

13 Claims. (o1. 74 2s0.si

My invention relates to pulleys so formed as to be economical in fabrication and consists of a plurality of sheet metal elements to provide lightness while at the same. time having the requisite strength and rigidity.

The inventionhas forits object the provision of a pulley which may be constructed to provide any number of belt receiving grooves.

My invention relates to a type of pulley which is more especially adapted for use in connection with the typeof generators employed on railroad car trucks and" also has for its object the provision of a pulley construction which may be readily assembled and applied to; the driving member ;or axle of the truck and with certain modifications maybe readily applied; to the driven memher or armature shaft of thegenerator; a pulley which will be practically self-balancing.

Another object ofthe invention is the provi sion of a pulley which will effecta rigid operative relation with the truck axle, whether of standard or special construction, and will; properly align itself therewith; aconstruction of u pulley which permits application to a truck axle without the necessity of removing the truck wheels. 1

A furtherobject of the in vention isthe formation of pulleys composed of sheet metal elements or sections which are interchangeable, with all spoke elements or sections and rim elements ;or

sections formed to a preselected standard to permit easy assembly. uu g u The above enumerated objects and others, as well as the advantages of my inventiomwill all bereadily comprehended from the following detailed. description of the accompanying drawings,

wherein:

Figure 1 illustrates one form of my improved pulley in side elevation shown applied to an axle or shaft. U

Figure 2 is a transverse sectional view taken on the off-set line 2 -2 in Figure 1.

Figure 3 is a perspective view of; a section or half of one form of hub of my improved pulley. Figure 4 is a perspective view; of asection of a rim. forming element. 1 Figureo is a perspective view of one of the spokes of my improved pulley.

Figure 6 is a detail sectional view illustrating a modifiedform of application of the hub by means of an adapterto a standard railroad car axle. i

Figure '7 is a side elevation of a modification of the pulley for application to the armature shaft of a generator. employed with railroad cars.

Figure 8 is a transversesectional view taken on" the oil-set linej8-8 of Figure '7, looking in u the direction of the arrows.

Figure .9 is a side elevation of a drive pulley involving certain modifications for application to a standard car axle. j

Figure 10 is a sectional view taken on the offset line Ill-40 of Figure 9. and viewed in the direction of the arrows. i

Figure 11 is a side elevation of a driving pulley applied to a special car axle and illustrating mod- 10 ified methods of reenforcement. p Figure 12 is a sectional view taken on the offset line |2 l2 of Figure 11 and viewed in the direction of the arrows.

Myinvention relates to pulleys which are espe- 16 cially intended for use on railroad cars for effecting a driving relation between a truck axle and the generator shaft, although equally adaptable to other uses; the invention for purposes of exempliflcation having been shown applied to a car 29 axle and to a generator shaft.

e The exemplification in Figuresl and 2, illustrating a type more particularly applicable to acar axle, consists of pre-shaped sheet metal elements formed to constitute hub elements,

spoke elements and rim elements.

The hub portion of the pulley, which may cohsist of two continuous or solid side members, in order to permit application to a car axle without removing the wheels preferably consists of two 30 similar sections for each side of the pulley as shown at 15 in Figure 3 of sheet metal of preselected dimensions and formed or pressed into shape to provide the flanges I6 and Il at the inner and outer perimeters; the flanges beingmade 5 to slope outwardly in opposite directions as more clearly shown in Figure 2, where the flange I6 conforms to the oppositely tapered enlargement l8 formed on the axle IS, in Figure 2; or to the adapter means shown at 2D in Figure 6 employed in connection with a standard axle 2i.

The flanges l6 and ll are disposed toward the outer sides of the pulleyelements or sections l5 and the flange ll terminatesin a substantially right angularly disposed perimetrical portion 22, 5 which, at predetermined spaced apart points, is provided with slots 23; and an enlarged slot 26; the slots 23 being preferably spaced apart substantially equal distances while the enlarged slot 24 is arranged between two adjacent slots 23 adjacent an end of each hub section as shown in Figures 1 and 3. The enlarged slots 24 are employed to receive two spoke members when the hub-sides consist of segmental sections.

The slots 23 and 24 are adapted to receive the ments, see Figure 2, when seated in the slots 23 and 24.

The other or outer longitudinal side of each spoke member 25 is provided with equally spaced" substantially V-shaped projections or apart, prongs 21, of number in keeping with the number of rim elements to be employed.- The'spokemember adjacent the base of each projection or prong and on each side is provided with a slot 28. Each spoke element25is also shown provided with the longitudinally spaced holes 29, for 'a'purpose hereinafter described, thus making the spoke ele' ments interchangeable for a pulley whose hub consists of continuous side sections or segmental sections as shown in Figure 1. l

The projections or prongs 21 and the slots 28 are adapted to receive the rim elements, each of which consists of a pair of sheet metal semi-circular segmental sections 3U, 30, see Figure 4. The driving belts more generally employed for driving the generator from'the car axle are of V- shape cross-section and therefore each rim element section consists of a semi-circular strip of sheet metal whose inner and outer perimetric'al portions 3| and 32 are off-set from each other with the intervening web portions 33 of the twosides of each rim element sloping or converging toward each other so that the outer perimetrical portions 32 of both sides will be in face-to-face' contact, while the inner perimetrical portions 3| are spaced apart to permit the webs 33 to straddle the projections or prongs 21 of the spoke elements, with the inner perimetrical portions 3| seated in the respective slots 28 in the spoke members at opposite sides of the projections or prongs 21.

After the spokes 25 have been arranged in the slots 23 and 24 of the hub elements, the rim-elements 30 are then inserted over the projections or prongs 21; the outer perimetrical flanges 32 of the complemental sections 30 aresecured together, preferably by spot welding, and the inner perimetrical flanges 3| are also preferably welded in the respective slots 28 of the spoke elements, with the web portions 33 of the complemental sections 3|), which straddle the V-shaped prongs of the spoke elements, preferably welded to theside edges of the projections or prongs 21 of the spoke elements, as shown in Figure 2, thereby providing circumferential substantially V-shape valleys or grooves for reception of the various belts, as shown at 35 in Figure 2.

When the hub sides consist of a pair of'segmental sections as shown in Figure 1, they are provided with; the enlarged slots 24 so as to receive a pair of spokeelements 25 which are preferably bolted to each other as shown at 36 in Figures 1 and 2, with the junctures between the segmental sections on the two sides of the hub shown in Figure 1.

The intermediate or web portions of the hubv sections are provided with a plurality of holes .38

1 arranged in two circumferential rows adjacent the inner and outer flange portions I6 and I1; the inner row being adapted to receive the bolts 39, while the holes in the outer row are adapted to receive the bolts 40, for drawing or forcing the two sides of the hub toward each other.

When the hub consists of segmental sections, I prefer to employ a pair of arcuate reenforcing plates 4| on each side of the hub to lap the junctures between the respective segmental sections;

that is to say, each reenforcing plate 4| is secured to the adjacent ends of the two. segmental sections of the hub, and hence the reenforcing plates on one side of the pulley will be in staggered relation with those on the other side because the splits or junctures between the segmental sections, as previously stated, are preferably arranged approximately ninety degrees apart.

Where the hub consists of two continuous an nular pressed plates, the reenforcing plates may be'omitted, as may also the enlarged slots 24 and the two pairs of bolt'edtogether spoke members shown in Figure l.

My improved pulley illustrated in Figure 2 is shown applied to an axle I9 provided with an integral enlargement |8 tapered in opposite directions on opposite sides of the circumferential median line of the enlargement, which latter is also reduced back substantially'to the main section of the axle and the enlargement centrally provided with a circumferentialvalley, as at 42, to increase the flexibility of the axle while at the same time making the axle more rigid than would be the case if the valley was omitted.

As shown in the drawings, the flare of the inner flange portion I6 of the hub elements approximates the taper of the enlargement l8, while the flare of the outer flange portion approximates the tapered surfaces 26 ofthe spoke elements 25;

It is apparent, that when the nuts'on bolts 39, which pass through the inner row of holes38 in the websof the hub elements, are equally screwed up on the bolts 39 that the flared flanges |6 will effect a wedging and gripping relation with the tapered surfaces of the axle enlargement I8,

thereby firmly locking the pulley to the axle, while at the same time causing the pulley to properly align with the axle and hence to be in proper parallel alignment with the pulley or element to be driven by means of the series of belts drive or controlled bythe axle pulley.

It is also apparent that when the nuts on bolts 40which pass through the outer row of holes 38 in the webs of the hub. elements-are screwed up, flared flanges will effect a Wedging relation with the tapered surfaces of the spoke elements which are held against outward radial movement by the plurality of rim segments seated therein and secured thereto as previously stated.

With the hub made in segmental-sections, my improved pulley may'be readily applied or replaced on a car axle without the necessity of removing the wheels; and where the-hub consists of segmental sections arranged with the junctures of the sections on opposite sides offset or ninety degrees apart, it will be noted that the two pairs of bolted together spoke elements 25 will be located in an enlarged slot 24 of a hub section on one side of the pulley and in the enlarged slot 24 of the other hub section on the opposite side of the hub, thereby supplementing the function of the reenforcing plates 4| in rigidly holding the segmental hub sections together: the bolted together spoke elements being disposed causes:thelatter' tobeheld'in position.

r mWhenmyimprovedwpulley is to be securedto.

the ordinary type of car axle, I providethe axle 2 21, see Figure 6, with an adapter comprising a rubber sleeve? 43 whose outer perimeter, similar to r theaxle enlargementxlll in Figure 2,-is pro-- vided iwith a double taper and. preferably surthe flared innerflange lb of the hub elements.

Whenthe nuts on bolts 39 are screwed up tightly,

rounded by a metallic member 44 made to con formto the rubbersleeve and adapted to receive thehub elements will move upwardlywtoward each other on the tapered surfaces, :causingthe rubber sleeve lit to bei coinpressed into snug gripping relation'iwith the axle 2!; The various elernentsbf the pulley in every other respect are the same asthose shown. in Figure 2and as heretoforedcscrib-ed; with the hub elements consisting either of continuous annular members or of seg'- mentalsectiens; therim being'prefcrablyof seg mental 1 sections which are preferably welded to there spectivespoke members, whichl atter, in orderto be interchangeable, are all provided with bolt receiving holes permitting their usein any InTigures 7 and a, r illustrate a modification number of preformed elements consisting of the pulleyfinamely l y secured tothe armat h w agenerator. i a l *The driven-or generator pulley also involvesa scribed, except thatthey may be made of con.- rurmeus annular members; secured together in as heretofore described to provide the V shaped grooves or beltreceiving channelsbetween 4s. The hub 49 is in the nature are remed each Dail, becallse i11'this instancellh poke members l6 may beinserted within the rim ele-' merits during assembly. Thespoke elements lfilon their outerperimeters arealso provided with the projections or prongs I daptedto fit between the cbmplemtantarysedtions for each rimelement aridwith the slots 28 ldapted toreceive the inner perimeters of the rim elements. The inner perimeters of the spoke ele merits 5 5, instead of havingthetapered surfaces, are eachprovided with a shortextensionfi'l which is'iritended to be permanently secured or Welded,

s shown at l8,to the cylindrical of sleeve thick tubingor sleeve with a tapared bore to rethe bore and shaft being-shown provided with a key-way at 5! and the end (if the armatureshaft being threaded and provided withanut and washer whereby the operative relation is maintained. Q t 4 I in order to reenforcethe spoke elements I prov vide the reenforcing plates or] gussets 52 disposed radially between therespective spokes with the inner ends preferably welded toj the hub lil while the sides are welded to the adjacent spokes,

thereby providing a very rigid structure.

'Thepulley in Figuret is shown. onsomewhat larger scale than the pulley in Figure 2;but it i's understood thatthe width of the spokes will correspond to the width of the spbk'esin the driving pulley. and likewise the belt receiving grooves till I g; or channelswill correspond @withthose of. the

driving pulley. r i i a It will also be understood thatl the pulleys may be made with anydesired number of beltreceiving grooves or channels; it being preferablegwhere the pulleys are used for driving the generators of 2,198,787. atwther?junctures between the'rimhsegments,

armature" shaft railroad cars, that a plurality of belts be employeda-" Theconstruction illustrated in Figures 9 and 10 is shown applied to a standard axle 2i provided with a; rubber adapter 20 which may consist' of equal segmental sections as disclosed in Figure 9 provided with metallic sleeve 44; the

adapter as'inthe previously described construction being provided with a double taper.

Each side of the hub is shown consisting of two equal segments I5, similar to that shown in Figure 3, withthe outer flange portions slotted to re- ..ceive the spoke members 25, similar to thatshown inFigure 5 and cut out to provide the tapering prongsand slots-to receive the rim elements 39, all

as heretofore described.

Inbthe structure shown inFigures 9 and 10, each spoke element 25 is provided with an encircling elongated metallic strap 53 arranged in close contact with the slotted faces ofthe spokes 25 at the base of the slots and hence adjacent the These reenforceing straps 53, at pointscoincident with the rim receving slots in the spoke members are then welded to the spokesand to the rim e1ementsythe. welds being preferably built up to segmental reenforcing plates 56, flared-outwardly at the outer perimeters in keeping with the flare of the hubelements; the plates beingpreferably Welded to the hu'o elements as shown at 51; the reenfor'cingplates fifi'at spacedapart points be-. ing preferably provided with gussets or radially disposed stifieners 58; the reenforcing plates 56 andhub members lbbeing apertured to receive the transversely disposed bolts as for holding the base or inner perimeter-of the rim elements 30. i

elements .in assembled relation. The hub ele-.

ments and reenforcingplates adjacent their 111- ner perimete'rs at intervals are apertured to receive the bolts 59 which also extendthrough lobes formed on the split collars 66 which encircle the inner orbaseflanges M5 on each side of the hub; the collars, adjacentthe splits beingv shown provided with radially disposedrears 8! which are apertured to receive bolts 62 whereby the collars arelclrawn tightly onto the baseflanges of the hub and the collars and huotelements on oppositesides are drawn toward each other by screwing up the nuts on bolts 59, thus causing the hub sides to ride up on the oppositelyltape-red sides of the: adapter'or axleenlargement and force the hub into firm gripping relation with the axle.

In Figures 11 and 12 I show continuous hub and rim elements and the pulleyapplied to a car axle iii providedwith'the oppositelytapered enlargemerit it similarto that shown in Figures 1 and 2; the hubsides 63, except that they are continuous or annular; are of the same general formation as ,th.e"hub segments [5 employed in the previouslydescribed constructions and shown in detail in 'Figure' 3, having. the inner or axle engaging flanges H5 and the outer flange portions 22 slotted toreceive the spoke elements 25 which are formed gto receivefthe rim' elements 6 3 which may be continuous and made substantially similar to the rim 2 elements heretofore described the spokes preferably being provided with the reenforcement straps 53 welded to the spokes and rim elements at the slots-in the spokemembersi; U r Y The sides of the hubjcoincident with' each spoke, is shown provided with the radially-disposed stiffener members 65 which extend from the inner flange l6 of the hub sides to the out-' 'wardly disposed flange portion l1 thereof; the stiffeners 65 being shown in the nature of channel plates with the sidesiof the channel disposed toward the hub sides; These channel plates-65 and the hub sides are'provided with registering apertures to" receive the transversely extending bolts 40 for drawing the opposite sides of the pulley toward each other and thereby efiect gripping relation with the tapered enlargement l8 of the axle. The stiffener members Here then preferably welded along the edges of the sides and at their ends to the hub side members as indicated in Figure'll at 66.

The various forms of pulley shown not only provide lightness in construction but also the requisite strength and rigidity required in axle :driven pulleys for driving the generator on rail road passenger cars; the exemplifications in practime are believed'to be the best embodiments which, however, may possibly be modified in certain respects without departingfromthe spirit of my invention as defined in the appended claims. 'i i What I claim is:

-1. A pulley of the character described consisting of preformed elements comprising hub-sections arranged in parallel spaced relation and having outwardly: sloping portions terminating in radially disposedperimeters'provided with circumferentially spaced slots;' elongated spoke forming elements provided with oppositely tapered surfaces on one longitudinal edge adapted to seat in said slots of the hub sections and having a plurality'of equally spaced and outwardly tapering projections or prongs on the other lon gitudinal edge; a plurality of rim elements provided with radially tapering annular sockets adapted to receive the tapering projections or prongs of the spoke elements; and means whereby the spaced hub sections are drawn toward each other and wedging relation with the tapered surfacesof the spoke elements effected.

2. A pulley of the character described comprising a hub portion composed of dished plates arranged in parallel spaced relation and provided with laterally extending portions at their inner and outer perimeters, the portions at the outer edges terminating in radially disposed perimetrical portions provided with circumferentially spaced slots; a plurality of spoke elements composed of elongated plates arranged transversely of the pulley and seated in the slots of the hub portion, the outer longitudinal edges of the spoke elements having outwardly tapering projections arranged in spaced relation and slots on opposite sides of the base of each projection; a plurality of rim elements whose opposite sides are composed of annularly arranged sloping sheet metal plates having flat radially disposed marginal portions, the marginal portions at the outer perimeters of the plates of each element being arranged -in face-to-face relation and secured together,

while the marginal portions at the inner perimeters of the plates are spaced apart and secured in said slots of the spoke elements and receive the spoke projection therebetween, said rim ele ments being arranged in spaced relation'to pro- Vida tapering belt receiving grooves ther'ebe-;

tween; and means whereby the plates at opposite sides of the pulley are drawn 'toward'each other andigripping relation with the spoke elements effecteduf 3. A pulley of the'character described compris at'the inner and outer perimeters of the strips with the flangesat the inner perimeters sloping downwardly to engage the tapered enlargement on theaxle while the flanges at the outer perimeters slope upwardly and terminate in radially disposed flat portions provided with circumferentially spaced slots, said segmental strips being'arranged to constitute spaced apart pulley side walls; a plurality of spoke elements disposed transversely of the pulley and having oppositely tapering sur-,-

faces seated in said slots while the outer longitu- 1 dinal edges of said elements are provided with rim attaching surfaces; rim elements composed of ring forming strips arranged in pairs and sloping toward each other with their outer perimeters secured together to form a rim element while their innerperimeters are attached to the outer longitudinal edges ofsaid spoke elements, the respective rim elements being spaced apart to provide belt receiving channels therebetween; and means whereby the side walls of the hubare forced toward each otherand wedging engagement with the axle enlargement and with the spoke elements effected. 7 v i 4. A pulley of the character described comprising a hub composed of flat sided segmental metallic strips provided withlaterally disposed portions at the inner and outer perimeters, the portions at the outer perimeters'terminating in radially v disposed flanges provided with circumferentially spaced slots, saidjsegmental strips constituting the side walls of the pulley, the side walls being arranged in parallel spaced relation; a plurality of elongated spokes arranged transversely of the pulley and seated in said slots, said spokes being provided with a plurality of radially extending projections; rim elements composed of complemental segmental preformed sections having oppositely sloping surfaces terminating in flat marginal portions, the marginal portions at the outerperimeters of the complemental sections being arranged in face to race relation and secured together, while the marginal portions at the inner perimeters of the respective sections are disposed on opposite sides of the correlated projections of the spokes and secured thereto; and means for securing the hub sidewalls together and inducing the latter to effect a binding relation with the spokes.-

5. A pulleyof the character described comprisinga hub portion; spoke elements disposed transversely" of and welded to the hub portion and provided with rim receiving slots arranged in spaced relation on the outer radially disposed bars arranged along opposite sides of each spoke plateadjacent the inner perimeters of the rim elements and welded to the spoke lplates and to the rim elements.

'LA pulley of the character described comprising a hub portion composed of laterally spaced apart arcuate plates flanged at the inner and outer perimeters, the flanges at the inner perimeters flaring outwardly to effect gripping relation with the axle whenthe plates at oppo- :site sides of the hub are drawn toward each other, while the flanges at the outer perimeters flare outwardly and radially and are provided with scircumferentially spaced slots: segmental band forming elements arranged on the flanges l atthe inner perimeters of the hub plates at op posite sides whereby the hub plates are drawn into clamping engagement with the car axle;

elongated spokeplatesdisposed transversely of l :the hub portion and seated in said slots to extend radially and their outer edges provided ,with tapering cut-out portions terminating in i radial slots; rim elements arranged in the slots of adjacent cut-out portions; and reenforcing bars arranged lengthwise of the spoke plates adjacent the radial slots and welded to the spoke {plates and to said rim elements.

8, A pulley of the character described comprising a hub composed of sheet metal spaced apart side walls slotted at their outer perimeters;

elongated spoke elements arranged t ansversely of the hub and seated in said slots, the outer edges of the spoke elements being of sawtooth formation with intervening slots; rim elements lcomposed of preformed areuate strips secured together at their outer perimetrical margins into V-shape formation in cross-section to match the saw-tooth formation of the spoke elements, the inner perimeters of said rim elements being seated in the slots of the spoke elements; reenforcing plates secured to the side walls of the hub; and means disposed through said plates and hub side walls for drawing the side walls toward each other. i

9. A pulley of the characterdescribed comprising a hub composed of sheet metal side walls arranged in spacedrelation and flared outwardlyiattheir outer and inner perimeters; segmental reenforcing platesflanged at their outer perirn 'eters to match the flared outer perimeters of the hub side walls, said plates having flange reenforcing gussets; elongated spoke elements arranged transversely ofthe hub and secured 3 to the outer perimeters of the hub side walls,

said elements being formed to provide rirn holding portions; sheet metal rim forming elements arranged to match the holding portionsof the spoke elements and to providea pluralityof substantially V-shape grooves therebetween; and

bolts disposed through said reenforcing plates and the hub side walls for drawing the side walls toward each other.

10. A pulley of the character described comprising, incombination withan axle having an oppositely tapered enlargement, a hub composed of spaced apart sheet metal side walls flared outwardly at their innerperimeters; spoke elements arranged transversely of and welded to l the hub and provided with rim receiving surfaces; sheet metal rim elements formed to match said surfaces of the spoke elements and arranged :to provide V-shape belt receiving grooves; means whereby the hub side walls of the hubare drawn toward each other and the flared portions forced into wedging engagement with the tapered enlargement of the axle; and split bands disposed aboutthe flared perimeters of the hub side walls for clamping the latter in place on the tapered axle enlargement.

11. A pulley of the character described comprising a hubyspoke elements arranged transversely of the pulley and with their inner longitudinal edges secured to the hub, the outer perimeters of the spoke elements being transversely slotted at spaced apart intervals; and rim forming elements, the side walls of each rim element consisting of separate preformed strips with a perimetrical portion at the inner perimeter adapted totseat in the slots of the spokei elements and welded inplace, while the outer perimetrical edges of the strips of the two sides of .the rim element are arranged in face-to-face relation and secured together.

12. In a fabricated pulley oflthe character described, a hub, spoke elements composed of elongated narrow flat-sided plates adapted to extend transversely of the hub with their longi-- tudinal edges disposed radially and the inner edges adapted, to be secured to the hub while the outer longitudinal edgeof each plate is provided with a plurality of equally spaced out-- wardly tapering projections and slots adjacent the baseof each projection; and a rim element composed of narrow strips of sheet metal shaped into annular form, united at the outer perimeter and spaced from each other at the inner perimeter to provide a rim element of substantially inverted V-shape cross-section adapted to minating in radially disposed flanges provided with circumferentially spaced apart slots while the flared portions at the inner perimeters slope to match the tapers of said adapter to effect wedging relationtherewith; spoke elements composed of elongated plates arranged transversely in the slots of the flanges of the hub members,

the inner longitudinal edges of the spoke plates being tapered toward opposite ends in conformance with the flare of the outer marginal portions of the hub members; rim elements of inverted V-shape cross-section secured at their inner perimeters to said spoke elements in spaced relation to provide a \l -shape beltnreceiving groove; and means whereby the sidewalls of the hub are forced toward each other into wedging engagement with said adapter and with the tapered edges of the spoke elements.

, KARL F. NYSTROM. 

